/Engine/Source/Runtime/GeometryCore/Public/Spatial/PointHashGrid3.h
TPair< PointDataType, RealType > FindNearestInRadius ( const [TVector](API\Runtime\Core\Math\TVector)< RealType > & QueryPoint, RealType Radius, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< RealType(const PointDataType &)> DistanceSqFunc ) const